Answer:
The negative counterpart
Step-by-step explanation:
x * -1 = -x
For example, 3 * -1 = -3
Hope this helps.
Step 1
Find the area of one equilateral triangle
Applying the law of sines

in this problem
a=b=7 cm
C=60 degrees
so

cm²
Step 2
To calculate the area of the hexagon multiply the area of one equilateral triangle by 
cm²
therefore
the answer is the option
73.5 sqrt 3cm²